Xerox WorkCentre 480cx User Manual page 203

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Ordinarily, good results can be obtained from your machine by leaving the
slider at its default value of 1.50 for Gray and 1.30 for Red, Green, and
Blue.
You may select the Reset Settings from the Settings menu to get the default
value. However, you can adjust the tone values of any or all of the color
channels of your images by selecting the Red, Green, or Blue Channel
buttons and dragging the sliders to change the Midtone value. You can also
directly enter a value in the textbox.
The Advanced Selection
The Advanced selection will present features that allow you to modify the
Level Adjustment and Tonal Map of the document.
For both the Level Adjustment and the Tonal Map functions, the window
displayed contains small representations, known as thumbnail views, of the
original and enhanced images (Samples 1 and 2).
To activate the Level Adjustment or Tonal Map functions, click on the
Advanced... button at the bottom of the Image Quality tab.
The Advanced... button
When this button is selected, the Level Adjustment window is displayed by
default.
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